https://wccftech.com/download-apple-releases-macos-big-sur-11-6-and-watchos-7-6-2-to-the-public/

A day before the big iPhone 13 event, Apple has seen fit to release macOS Big Sur 11.6 and watchOS 7.6.2 to the general public. The new update arrives with a bunch of important security fixes and under the hood improvements. If you happen to own a compatible device, be sure to download it on your device right now.

macOS Big Sur 11.6 can be downloaded on your compatible Mac using the Software Update mechanism under System Preferences. Apple's release notes suggest that the new macOS Big Sur 11.6 is recommended for all users. The company has also released a security update for 2021-005 for macOS Catalina. Both updates offer to fix the issue that allows maliciously crafted PDF to execute code.